Aspect Ratio Calculator

Simplify a width and height into an aspect ratio.

Aspect ratio 16:9

Ratio (decimal) 1.778

Formula: divide both sides by their greatest common divisor

Step-by-step with your numbers:

1. Values used:

2. Width = 1,920 px

3. Height = 1,080 px

5. Aspect ratio = 16:9

6. Ratio (decimal) = Width / Height = 1,920 / 1,080 = 1.778

Did we solve your problem today?

Reduce any width × height to its simplest aspect ratio — useful for screens, images and video.

The math behind it

Divide both width and height by their greatest common divisor (GCD) to get the simplest whole-number ratio.

1920 × 1080 → GCD 120 → 16:9 (1.778).

What are common ratios?

16:9 (widescreen), 4:3 (old TVs), 1:1 (square), 21:9 (ultrawide).